Selecting apparatus.



O. A. DANIELSON.

SELECTING APPARATUS.

urucumn rum APR.10, 1913 1,086,899. Patented Feb. 10, 1914.

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UNITED STATES PATENT OFFICE.

OSCAR A. mmmnsou, OF new YORK, N. Y., nssron'on To wxs'r'mm ELECTRIC COMP NY, OF NEW YORK, N. Y., A CORPORATION OF ILLINOIS.

SELECTING APPARATUS.

Specification 0t Letters Patent.

Patented Feb. 10, 1914.

utilis ion mad Ap 0, 15113- Ser al no. 760,232.

To all whom it may concern Be it known that I, OSCAR A. DANIELSON, a citizen of the United States, residing at New York, in the county and State of New York, have invented a certain new and useful Improvement in Selectin Apparatus, of which the following is a all, clear, concise, and exact description.

This invention relates to electrical selecting apparatus and is particularly adapted for use in printing telegraph receivers although not exclusively limited to such use. This invention is disclosed but not claimed in a copending application of Arthur H. Adams and Amos 1'. Dixon, Serial 0. 737,851 filed December v20, 1912 and. assigned to my assignee.

The object of this invention is to provide an electrical selecting apparatus of the above type which is capable of furnishing the required circuit connections by the use of a small number of relays.

To the above end a plurality of polarized relays is'provided, so arranged in the main line com'luctors and so interconnected in a novel manner, that secondary circuits may be selected upon the receipt of a combination of impulses from a distant transmitting station.

This invention will be fullyunderstood from the following description taken in connection with the accompanying drawing in which the selecting apparatus is shown diagrammatically.

The current impulse-transn'iitting apparatus at a distant station may be of any suitable form as, for example, keys 10, 20, 30 and 40 which control the application of cur rent from two grounded sources of energy and 51. By the proper manipulation of these current control keys, the desired combination of positive and negative impulses may be transmitted over the main line conductors L and L which provide connections betweenthe transmitting apparatus at a distant station and the selecting apparatus at a receiving station. These conductorsare preferably grounded through polarized relays 55, 56, 57 and 58. The polarized rclays 55, 56, 57 and 58 may be polarized in any manner, but it has been found convenient to furnish each relay with a second winding through which current from a rounded source of energy 60 normally ows. This polarizing circultmay be traced from grounded battery (30, conductor 62, lower winding of relay 56, conductor 63, lower winding of relay 58, conductor 64, lower winding of relay 55, conductor 65, lower winding of relay 57 to ground and back to battery. Two of the relays, one in each main line conductor, are wound so as to be operative on positive current only, and the other relay in each main line conductor is wound to be responsive to negative currents only. In the selecting apparatus shown, relays and 57 are polarized to respond to positive currents only and relays 5t; and 58 to respond to negative currents only. The polarized relays 55, 56, 57 and 58 control the selection of secondary circuits 70, 80, 90, 100, 110 and 120 in which are located secondary relays 130, 140, 150, 160, 170 and 180. The secondary relays may control the connection to circuits 192, 194, 196, 198, 200 and 204 and in each of the circuits 1.91 to 204 inclusivemay be connccted groups of type magnets to form a plurality of type selecting branches. However, the particular arrangement of apparatus in the secondary circuits is immaterial to the operation of the system of this invention.

A sutlicient description of the details of the circuit will appear from the following description of the operation of receiving a particular combination of impulses over the main line conductors L and ii. Let it be assun'ied that. a selection is desired requiring the combination of a negative impulse over line conductors L and L simultaneously followed, after an interval of no current, by a positive impulse over line conductor L. A negative impulse arriving simultaneously over line conductors L and L passes through the polarized relays 55, 56, 57 and 58 to ground, causing only the negatively polarized relays 56 and 58 to attract their armat-ures. The attraction of the armatures of relays 56 and 58 closes a ground connection for the secondary circuit 110 containing the relay 170, through the lower armature of relay 56 and the armature of relay 58. At the cessation of the first impulse, the polarized relays return to normal in condition to receive a second impulse. The second impulse passes through both relays 55 and 56, the former being the only one energized. A ground is thereby provided forthe secondary circuit 70 containing the relay 13.0, through the armature of relay 55 any of said secondary circuits upon the re- 10 and the upper armature of relay 57. oeipt of current impulses from said main What I claim is: line conductors.

In a selecting apparatus the combination In witness whereof, I hereunto subscribe of a pair of main line conductors, two pdlarmy name this 7th day of April A. D. 1913. ized relays in each main line conductor, said I OSCAR A. DANIELSON. relays being connected in parallel, six sec- Witnesses: ondarv circuits, and circuit connections R. O. HINKLE, whereby said polarized relays may complete W. F. HOFFMAN. 

